I'm not sure
@CDitzel in regards to the chicks and ducklings. The chicken manure I use is granulated, and composted. But in terms of pine shavings, as I have a bit of that too from guinea pig bedding, it's supposed to be rotted down before being added to the garden because it ties up nitrogen until it's decomposed. Maybe mixing it with topsoil alters that. As a rule I don't add the pine bedding to my garden because of the nitrogen tie up. However, I will pour it around my rhubarb and currant bushes to block weeds out and keep moisture in, and doesn't seem to do those plants any harm. A gardener whose material I read, Bob Flowerdew, has a site with good information about various mulches; somewhere in there (that I couldn't find!) he mentions that wood shavings are not a good garden addition (fresh) for reasons tied to microflora.